Journal of Biosciences

, Volume 17, Issue 1, pp 29–34 | Cite as

Short-day experience is not a prerequisite for the termination of photorefractoriness in the reproductive cycle of baya weaver,Ploceus philippinus

  • Mahabir Bisht
  • Asha Chandola-Saklani
Article

Abstract

In most photoperiodic avian forms (irrespective of temperate or tropical distribution) including the baya weaver,Ploceus philippinus, seasonal reproduction comes to an end due to the development of a photoperiodically controlled photorefractory phase when birds cease to respond to the stimulatory effect of long days. In the present paper photoperiodic control of the termination of photorefractory phase has been examined by studying the effect of short-day exposure lasting 4–6 months on long-day response of birds. Results indicate that unlike in other photoperiodic birds short-day exposure of winter is not a prerequisite for the termination of photorefractory phase in the reproductive cycle of baya weaver. Artificial long days on the other hand hasten the termination of this phase. Refractory phase in baya weaver, therefore, unlike that in temperate forms, is a temporary state resulting most likely from a sequel of physiological events triggered by long days of spring/summer which temporarily mask the photostimulatory response. Spontaneous termination of photorefractoriness in birds of tropical habitats may have a selective value imparting to the reproductive cycle the necessary elasticity for adaptation to diverse ecological conditions.

Keywords

Photorefractoriness photoperiod reproductive cycle tropical baya 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Balasubramanian K S and Saxena R N 1972 Effect of pinealectomy in the reproduction of Indian weaver birdsPloceusphilippinus;J. Exp. Cool. 85 333–340Google Scholar
  2. Chakravorty K and Chandola-Saklani A 1985 Termination of seasonal breeding in a weaver finchPloceus philippinus: Role of photoperiod;J. Exp. Zool. 235 381–386CrossRefGoogle Scholar
  3. Chakravorty K, Sharma K K, Bhatt D and Chandola A 1985 Control of seasonal reproduction in tropical weaver bird; inThe endocrine system and the environment (ed) B K Follett, S Ishi and A Chandola (Tokyo: JSSP and Berlin: Springer-Verlag) pp 157–165Google Scholar
  4. Chandola A, Thapliyal J P and Pavnaskar J 1974 The effect of thyroidal hormones on the ovarian response to photoperiod in a tropical finchPloceus philippinus;Gen. Comp. Endocrinol. 24 437–441PubMedCrossRefGoogle Scholar
  5. Chandola A and Chakravorty K 1982 Termination of seasonal breeding in the photoperiodic weaver bird;J. Exp. Cool. 222 169–172CrossRefGoogle Scholar
  6. Chandola A, Bisht M and Bhatt D 1983 Reproductive strategies in birds of the tropics; inAdaptation to terrestrial environment (ed) N S Margaris, M A Faraggitaki and R J Reiter (New York: Plenum Press) pp 145–164Google Scholar
  7. Chandola A. Singh S and Chakravorty K 1985 Reproductive periodicity in weaver finch; inACTA X VIII Congr. Int. Ornithol. (ed) V D Ilychev and V M Gavrilov (Moscow: Nauka) II 468–477Google Scholar
  8. Chandola-Saklani A, Lakhera P and Bisht M 1988a Mechanism(s) involved in the termination of seasonal reproduction in low latitude birds; inACTA XIX Congr. Int. Ornithol. (ed.) H Ouellet (Ottawa: University Press) Vol 1, pp 612–625Google Scholar
  9. Chandola-Saklani A, Bisht M and Lakhera P 1988b The photorefractory phase in the reproductive cycle of tropical baya weaver; Phylogenetic considerations;Fourth Int. Symp. on Avian Endocrinology, Tokyo, pp 68–69Google Scholar
  10. Chandola-Saklani A, Sharma K K, Bisht M S and Lakhera P 1990 Ecophysiology of seasonal reproduction in the tropics: the baya weaver; inEndocrinology of birds: Molecular to behavioral (ed) M Wada, S Ishii, C G Scanes (Tokyo: JSSP and Berlin: Springer-Verlag) pp 207–244Google Scholar
  11. Farner D S and Follett B K 1966 Light and other environmental factors affecting avian reproduction;J Anim. Sci. (Suppl.) 25 90–178Google Scholar
  12. Farner D S and Follett B K 1980 Reproductive periodicity in birds; inHormones and Evolution (ed.) E J W Barrington (New York: Academic Press and London: San Fransisco) pp 829–872Google Scholar
  13. Fisher R A 1963Statistical methods for research workers (London: Oliver and Boyd)Google Scholar
  14. Hamner W M 1968 The photorefractory period of the house finch;Ecology 49 212–227CrossRefGoogle Scholar
  15. Kumar V and Tewary P D 1982 Photoperiodic testicular response and photorefractoriness in common Indian rose finch;Environ. Control Biol. 20 39–42Google Scholar
  16. Lal P and Thapliyal J P 1985 Photorefractoriness in migratory red-headed buntingEmberiza bruniceps; inThe endocrine system and the environment (ed) B K Follett, S Ishii and A Chandola (Berlin: Springer-Verlag) pp 137–148Google Scholar
  17. Lofts B 1962 Photoperiod and the refractory period of reproduction in an equatorial birdQuelea quelea;Ibis 104 407–414Google Scholar
  18. Singh S and Chandola A 1981 Photoperiodic control of seasonal reproduction in tropical weaver bird;J. Exp. Cool. 216 293–298Google Scholar
  19. Singh S and Chandola A 1982a Seasonal variation in photogonadal response of tropical weaver bird;Gen. Comp. Endocrinol 45 521–526Google Scholar
  20. Singh S and Chandola A 1982b Role of gonadal feedback in annual reproduction of weaver bird: Interaction with photoperiod;Gen. Comp. Endocrinol. 48 123–125PubMedCrossRefGoogle Scholar
  21. Tewary P D and Dixit A S 1983 Photoperiodic control of the ovarian cycle in the rose finchCarpodacus erythrinus;J. Exp. Zool. 228 537–542CrossRefGoogle Scholar
  22. Thapliyal J P and Saxena R N 1964 Absence of refractory period in the common weaver bird;Condor 66 5–208CrossRefGoogle Scholar
  23. Turek W 1972 Circadian involvement in termination of refractory period in two sparrows;Science 178 1112–1113PubMedCrossRefGoogle Scholar
  24. Wolfson A 1958 Regulation of refractory period in the photoperiodic responses of the white-throated sparrows;J. Exp. Zool. 139 349–380PubMedCrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1992

Authors and Affiliations

  • Mahabir Bisht
    • 1
  • Asha Chandola-Saklani
    • 1
  1. 1.Reproductive and Wildlife Biology UnitGarhwal UniversitySrinagar GarhwalIndia

Personalised recommendations